Why did passage of the kansas-nebraska act anger many free-soilers? a: it established slavery throughout the united states. b: it established slavery in two new united states territories. c: it removed a ban on slavery and supported popular sovereignty. d: it upheld the missouri compromise, which they did not support.

The correct answer is C. The passage of the Kansas-Nebraska Act angered many Free-Soilers because it removed a ban on slavery and supported popular sovereignty.

Explanation:

The Kansas-Nebraska Act was a federal law voted on May 30, 1854, which organized a territorial government for the territories that would later become the states of Kansas and Nebraska. Opponents of this law saw in it the triumph of slave power and created a new party (the Republican Party) to fight against it. This act was considered as a key step in the historical course that would lead to the Civil War.  

Since most of the western territories extended north of the line of division defined by the Missouri Compromise, they wouldn't be allowed to practice slavery. Therefore, Southern representatives wouldn't be able to preserve their dominance in the Senate. Avoiding this problem, the Kansas-Nebraska Act allowed to overcome the Missouri Compromise and allowed slavery in the new territories, stating that this issue had to be decided by each state by "popular sovereignty."

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